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SX1512BIULTRT Datasheet(PDF) 14 Page - Semtech Corporation

Part No. SX1512BIULTRT
Description  World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SX1512BIULTRT Datasheet(HTML) 14 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
Rev 3 – 9
th Sept. 2010
14
www.semtech.com
SX1510B/SX1511B/SX1512B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
4.3
SX1512B 16-channel SPI GPIO with LED Driver and Keypad Engine
SPI Bus
Control
VCC1
Reset
VDDM
NRESET
Interrupt
8-Bit
R/W
I/O[0]
I/O[1]
I/O[2]
I/O[3]
I/O[4]
I/O[5]
I/O[6]
I/O[7]
GND
VCC2
LED Driver
Blink (Timer)
Breath (Ramp)
Intensity (PWM)
Clock Mgmt
Internal
Oscillator
External
Clock
I/O Bank A
A
I/O Bank B
A
SX1512B
I/O[8]
I/O[9]
I/O[10]
I/O[11]
I/O[12]
I/O[13]
I/O[14]
I/O[15]
8-Bit
R/W
NINT
OSCIO
SCK
SO
SI
NSS
Keypad
Engine
Auto
Sleep/Wakeup
64 Keys Max
Figure 7 – 16-channel Low Voltage GPIO with LED Driver and Keypad Engine
4.4
Reset
4.4.1
Hardware (NRESET)
The SX1510B, SX1511B and SX1512B generate their own power on reset signal after a power supply is
connected to the VDDM pin. NRESET input pin can be used to reset the chip anytime, it must be connected to
VDDM (or greater) either directly (if not used), or via a resistor.
Figure 8 – Power-On / Brown-out Reset Conditions
1. Device behavior is undefined until VDDM rises above VPOR, at which point internal reset procedure is
started.
2.
After tRESET, the reset procedure is completed.
3.
In operation, the SX1510B, SX1511B and SX1512B may be reset (POR like or LED driver counters only
depending on RegMisc setting) at anytime by an external device driving NRESET low for tPULSE or longer
Chip can be accessed normally again after NRESET rising edge.
Undefined
t
RESET
Reset
Signal
VDDM
VPOR
t
PULSE
VDROPH
Undefined
t
RESET
Undefined
1
2
3
4
5
6
2
1
VDROPL


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